Changes for supernova release

[popenta]

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[Copilot]

Pull request overview

This PR prepares the SDK for the "supernova release" by introducing several changes to support new network features and improve transaction handling.

Changes:

• Added millisecond-precision block timestamp support via new blockTimestampMs field
• Reduced default polling timeout from 6000ms to 600ms across account and transaction watchers
• Added support for "not-executable-in-block" transaction status as a failed state
• Consolidated timeout constants from hardcoded values to centralized constants

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/networkProviders/networkStatus.ts	Added blockTimestampMs field for millisecond timestamp precision
src/networkProviders/constants.ts	Reduced account polling timeout from 6000ms to 600ms
src/core/transactionWatcher.ts	Refactored to use centralized constants instead of hardcoded timeout values
src/core/transactionWatcher.spec.ts	Added test coverage for "not-executable-in-block" status
src/core/transactionStatus.ts	Added "not-executable-in-block" as a failed transaction status
src/core/constants.ts	Defined new transaction awaiting timeout constants
package.json	Bumped version to 15.4.0
package-lock.json	Updated version lockfile to 15.4.0

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[AdoAdoAdo]

Is this correct for the unexecutable to be reported as failed?

this was not executed, similar to higher nonce or lower nonce in transaction.
It may be executed in a different block afterwards (for higher nonce for example, if the gap is filled)